prj/tech/libsrc/r3d/primfunc.c

   1 // $Header: x:/prj/tech/libsrc/r3d/RCS/primfunc.c 1.22 1997/10/03 13:03:23 KEVIN Exp $
   2
   3 #include <dbg.h>
   4
   5 #include <ctxts.h>
   6 #include <clipcon_.h>
   7 #include <prim.h>
   8 #include <primcon_.h>
   9 #include <primfunc.h>
  10 #include <primpoly.h>
  11 #include <primtab_.h>
  12
  13 // remove debugging macro
  14 #undef r3_compute_prim_funcs
  15
  16 static int (*tmap_3d_funcs[])(int, r3s_phandle *, r3s_texture) =
  17 {
  18    r3_any,
  19    r3_clip_any,
  20    r3_check_any,
  21    r3_check_clip_any,
  22 };
  23
  24 static int (*poly_3d_funcs[])(int, r3s_phandle *) =
  25 {
  26    r3_implicit_any,
  27    r3_clip_implicit_any,
  28    r3_check_implicit_any,
  29    r3_check_clip_implicit_any,
  30 };
  31
  32 static int (*prim_line_func)(r3s_phandle p0, r3s_phandle p1);
  33 static int (*prim_point_func)(r3s_phandle p);
  34 static poly_setup_func *poly_setup_funcs;
  35 static int (*convert_func)(int n, r3s_phandle *vl);
  36
  37 // use this to setup alternative drivers (like d3d, for example)
  38 void r3_setup_prim_funcs(
  39    poly_setup_func *setup_func_list,
  40    int (*convert)(int n, r3s_phandle *vl),
  41    int (*line_func)(r3s_phandle p0, r3s_phandle p1),
  42    int (*point_func)(r3s_phandle p))
  43 {
  44    poly_setup_funcs = setup_func_list;
  45    convert_func = convert;
  46    prim_line_func = line_func;
  47    prim_point_func = point_func;
  48 }
  49
  50 #if 0 // i think these are pretty obsolete
  51 typedef int (*tmap_func)(grs_bitmap *, int n, grs_vertex **);
  52
  53 int r3_tluc8_poly(int c, int n, grs_vertex **v)
  54 {
  55    gr_tluc8_poly(c, n, v);
  56    return 0;
  57 }
  58
  59 void r3_tluc8_upoly(int c, int n, grs_vertex **v)
  60 {
  61    gr_tluc8_upoly(c, n, v);
  62 }
  63 #endif
  64
  65 // determine which parameters to clip
  66 static int clip_flags[] =
  67 {
  68    0,
  69    R3_CLIP_I,
  70    R3_CLIP_RGB,
  71    R3_CLIP_I,
  72    0,
  73    R3_CLIP_I,
  74    R3_CLIP_RGB,
  75    R3_CLIP_I,
  76    R3_CLIP_UV,
  77    R3_CLIP_ALL,
  78    R3_CLIP_RGB | R3_CLIP_UV,
  79    R3_CLIP_ALL,
  80    R3_CLIP_UV,
  81    R3_CLIP_ALL,
  82    R3_CLIP_RGB | R3_CLIP_UV,
  83    R3_CLIP_ALL
  84 };
  85
  86   // internal function to set up function pointers
  87 #ifdef DBG_ON
  88  void r3_compute_prim_funcs(int funcs, char *name)
  89 #else
  90  void r3_compute_prim_funcs(int funcs)
  91 #endif
  92 {
  93    int poly_mode;
  94
  95    r3_convert_func = convert_func;
  96
  97      // compute poly index if we do any 3d poly functions
  98    if (funcs & (R3FUNC_3D_POLY | R3FUNC_3D_TMAP)) {
  99       if (r3d_poly_flags & R3_PL_CHECK_FACING)
 100          poly_mode = r3d_clip_mode != R3_NO_CLIP ? 3 : 2;
 101       else
 102          poly_mode = r3d_clip_mode != R3_NO_CLIP ? 1 : 0;
 103    }
 104
 105    if (funcs & R3FUNC_3D_POLY) {
 106       switch (r3d_poly_flags & R3_PL_MODE_MASK) {
 107          case R3_PL_POLYGON:
 108             r3_3d_poly_func = poly_3d_funcs[poly_mode];
 109             break;
 110
 111 #ifdef DBG_ON
 112          case R3_PL_TRISTRIP:
 113             Warning(("r3d: r3_compute_prim_funcs:\n  TRISTRIP mode not supported in %s\n", name));
 114             break;
 115
 116          case R3_PL_TRIFAN:
 117             Warning(("r3d: r3_compute_prim_funcs:\n  TRIFAN mode not supported in %s\n", name));
 118             break;
 119
 120          case R3_PL_QUADSTRIP:
 121             Warning(("r3d: r3_compute_prim_funcs:\n  QUADSTRIP mode not supported in %s\n", name));
 122             break;
 123
 124          default:
 125             Warning(("r3d: r3_compute_prim_funcs:\n  Unhandled polygon drawing mode in %s\n", name));
 126 #endif
 127       }
 128    }
 129    if (funcs & R3FUNC_3D_TMAP) {
 130       switch (r3d_poly_flags & R3_PL_MODE_MASK) {
 131          case R3_PL_POLYGON:
 132             r3_3d_tmap_func = tmap_3d_funcs[poly_mode];
 133             break;
 134
 135 #ifdef DBG_ON
 136          case R3_PL_TRISTRIP:
 137             Warning(("r3d: r3_compute_prim_funcs:\n  TRISTRIP mode not supported in %s\n", name));
 138             break;
 139
 140          case R3_PL_TRIFAN:
 141             Warning(("r3d: r3_compute_prim_funcs:\n  TRIFAN mode not supported in %s\n", name));
 142             break;
 143
 144          case R3_PL_QUADSTRIP:
 145             Warning(("r3d: r3_compute_prim_funcs:\n  QUADSTRIP mode not supported in %s\n", name));
 146             break;
 147          default:
 148             Warning(("r3d: r3_compute_prim_funcs:\n  Unhandled tmap drawing mode in %s\n", name));
 149 #endif
 150       }
 151    }
 152
 153    if (funcs & R3FUNC_2D_POLY) {
 154       int index = r3d_poly_flags & (R3_PL_TEXTURE_MASK + R3_PL_LIGHT_MASK);
 155
 156       if (r3d_clip_2d)
 157          index+=2;
 158
 159       r3_2d_poly_setup_func = poly_setup_funcs[index>>1];
 160       r3d_clip_flags = clip_flags[index>>2];
 161       r3d_do_setup = TRUE;
 162    }
 163    if (funcs & R3FUNC_2D_LINE) {
 164       r3_2d_line_func  = prim_line_func;
 165    }
 166    if (funcs & R3FUNC_2D_POINT) {
 167       r3_2d_point_func = prim_point_func;
 168    }
 169 }